Hi all,
Puzzled at why the XG210 is rejecting some packets.

I've read the forums, could this related to conn_track? This is so strange.
On v18.5
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Hi SHtan,
Thank you for reaching out to Sophos Community.
Click here to know more information on 'Invalid traffic events'.
There is no help for this. Its not actual traffic blocked. Instead this traffic is simply "invalid traffic" as it is most likely dropped traffic anyways.
You can simply disable the invalid traffic logging (i never used it in my 5 years SFOS).
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thanks LuCar Toni I guess that’s closure